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44 lines
2.6 KiB
HTML
44 lines
2.6 KiB
HTML
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<p>Sometimes people repeat letters to represent extra feeling. For example:</p>
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<ul>
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<li><code>"hello" -> "heeellooo"</code></li>
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<li><code>"hi" -> "hiiii"</code></li>
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</ul>
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<p>In these strings like <code>"heeellooo"</code>, we have groups of adjacent letters that are all the same: <code>"h"</code>, <code>"eee"</code>, <code>"ll"</code>, <code>"ooo"</code>.</p>
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<p>You are given a string <code>s</code> and an array of query strings <code>words</code>. A query word is <strong>stretchy</strong> if it can be made to be equal to <code>s</code> by any number of applications of the following extension operation: choose a group consisting of characters <code>c</code>, and add some number of characters <code>c</code> to the group so that the size of the group is <strong>three or more</strong>.</p>
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<ul>
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<li>For example, starting with <code>"hello"</code>, we could do an extension on the group <code>"o"</code> to get <code>"hellooo"</code>, but we cannot get <code>"helloo"</code> since the group <code>"oo"</code> has a size less than three. Also, we could do another extension like <code>"ll" -> "lllll"</code> to get <code>"helllllooo"</code>. If <code>s = "helllllooo"</code>, then the query word <code>"hello"</code> would be <strong>stretchy</strong> because of these two extension operations: <code>query = "hello" -> "hellooo" -> "helllllooo" = s</code>.</li>
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</ul>
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<p>Return <em>the number of query strings that are <strong>stretchy</strong></em>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> s = "heeellooo", words = ["hello", "hi", "helo"]
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<strong>Output:</strong> 1
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<strong>Explanation:</strong>
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We can extend "e" and "o" in the word "hello" to get "heeellooo".
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We can't extend "helo" to get "heeellooo" because the group "ll" is not size 3 or more.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = "zzzzzyyyyy", words = ["zzyy","zy","zyy"]
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<strong>Output:</strong> 3
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= s.length, words.length <= 100</code></li>
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<li><code>1 <= words[i].length <= 100</code></li>
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<li><code>s</code> and <code>words[i]</code> consist of lowercase letters.</li>
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</ul>
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